This photo shows the small town of Marifjøra, which looks out onto the Sognefjord.

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The Sognefjord is the largest and best known fjord in Norway. Although it's the third-longest in the world, it's technically the world's longest open fjord since the other two are often covered in ice.

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The towns that sit along the fjords are just as picturesque as the fjords themselves. This town is called Undredal.

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Because fjords have what are called "sea thresholds" — a shallow barrier at the mouth of the fjord — they're more calm than the sea, making them great natural harbors.

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Here's the quaint village of Flåm, which is in Flåmsdalen, located at the inner end of Aurlandsfjorden, a branch of the Sognefjord.

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This is Olden, nestled at the inner end of the Nordfjord.

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And this is Ålesund, a town near the Hjørund and Geiranger fjords.

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The Geirangerfjord is listed as a UNESCO world heritage site.

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So is the town of Bryggen in Bergen, which is surrounded by the Sognefjord.

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The homes and buildings near the fjords are straight out of a postcard. This home is in Balestrand, which sits on the northern shore the Sognefjorden.

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Visitors to the fjords will also see majestic waterfalls.

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Incredible sunsets...

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And maybe make some friends along the way, like these sheep.

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The fjords are a great destination for adventurous travelers who like the outdoors.

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Bikers...

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Paragliders...

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Hikers...

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Yogis...

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And kayakers.

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The flowers are beautiful around this time of year.

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These pink flowers look out over the Storfjorden.

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Even when it's a cloudy day the fjords still look like they're straight out of a fairytale.

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They're a sight you won't regret or forget seeing.

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If you like Norway's fjords, you'll probably like Alberta, Canada's scenery too.